SFRAC 6.1 on Solaris 10 Supportability

I have a customer who is upgrading a critical SFRAC cluster with global apps and has a question about the supportability of 6.1 Sol 10 with u8 base.

Our documentation states that that 6.1 is compatible with Sol 10 update 9 onward. Does this mean a Sol 10 U9 BASE build or a kernel patch that serves u9 and higher? Their current nodes are running a base Sol10 U8 build but will be patched to get to ~u11 release…but the base still remains u8…if referring to the /etc/release file. Need some clarification on this as soon as possible.